Valve gearing and motion for locomotives.



- PATENTED JUNE 25, 1907. R. LINDNER.

VALVE GEARING AND MOTION FOR LOCOMOTIVES.

APPLIGATION FILED MAY 14. 19'06.

' 5v SHEETS-SHEET No. 857,813. PATENTED JUNE 25,1907

R. LINDNER. y VALVE GEARING AND MOTION FOR LoGoMoTIVEs.

APPLICATION FILED MAY 14, 1906.

` B SHEETS-SHEFT 2.

PATBNTED JUNE 25. 1907 R. LINDNER. VALVE GBARING AND MOTION POR LocoMoTIVEs.

APPLICATION FILED MA 14, 1 6. Y 90 5 SHEETS-SHEET 3.

? Weiz PATNNTEDIJUNE 25,1907.

D. LINDNER. l VALVNGEARING AND MDTIDN PDD LDGOMDTIVES.

APPLICATION FILED MAI 14. 1'906.

.n.sIIDETs-sHi/NT 4,

PATBNTED JUNE 2,5, 1907.

N; LINDNER. VLVN GEANING AND MOTION NOR` LQcoMoTIVEs..

5 SHEETS-SHEET4 5.

l APPLICATION FILED MAY 14. 1906.

4o than heretofore.y

UNITED sTTEs PATENT oEEIoE.

'Y ROBERT LINDNER, oF DRESDEN, GERMANY,

VALVE" GEARING AiND A IVIOTION FOR "LOCONIOTIVES- specification' of Letters Patent. `.Application 'filed May 14,1906. Serial No. 3116.685.

'Patented June 25,1907.

To @ZZ whom it may concern/ .1

Be it known that I, ROBERT LINDNER, a subject of the King of Saxony, and a resident of No. 2 Borsbergstrasse,\Dresden, in the '5 Kingdom of Saxony, German Empire, haveinvented certain new and jusefulImpro've- Aments in Valve Gearings-and AMotions for Locomotives, of which the 'iollowing is an eX-A actspeciiication. Y y lo My Inventlon relates to anew and 1mproved valve motion fori steam engines and` ocomotives, and is more especially-applicable to twin -cylinder engines and -locomo- Asis known the 'setting'of the drivingv tives. `z 5 cranks in such engines at-QO-degrees with regard .to one another requires the adjustment of theivalve motion to givecharges of steam which shall be as large as possible, for instance steam is admitted over about 0,8 of

' 2,0 the length of thef-pistonstrke, kin order to obtainfagood starting off/'the engine." The starting is sometimes effected by one iston -whose corresponding crank 'isisutcient' y: distant from the dead center, the steam admis- 2 5 sion to the other piston being cut off by its For therunning of the distributing valve. locomotive however considerably smaller charges of steam are sulhcient'and the cut oil takes place about 0,5 of the piston.stroke.`

3o Therefore I have provided a valve motion in which the greatest charge of steam corresponds to a cut off at half stro-ke, but in which the maximum slide valvetravel hitherto Vl -In order to make my invention clear, I refer to the accompanying drawing in which:

Figures l & 2 are longitudinal sections of I 5 o. slide valves to be used in accordance with my invention, Fig. 3 isa diagram for showing the corresponding slide valve movements. Fig. 4 is an end view of a steam engine showing one improved arrangement of valve and 55 valve gear. Fig. 5 illustrates an arrange-4 vment of valve motion according to this invention artly in diagrammatical manner .and part yin elevation and longitudinal section, the sections on the valves being taken o tl'el lines 1 2 3, .4 of Fig. 4. Fig. 6 is a v.section takenl through-the valves upon the lines 5, 6.', 7, 8 of Fig. 4. Figs. 7 8a 8 are similar yviews to Fig. 5y vbut showing the. valves Vand earing in different positions. 1 Figs. 9 to 11 il ustra-te. another form of valve motion arrangedaccordin to ymy invention the views being part y diagrammatical .and

partly in longitudinal section and` side eleva# tion. 1 Fig. 12 isa .valve diagram corresponding to the arrangement seen in Figs. 9 to 11,

andFigs. 13 & 14 are diagrams of two further j modifications of my invention. Fig. 13a representsa face view of the slide-valve showing the admission portsd and z. c I

According to my invention the large vo1" main slide valve S (Fig. 1)'.has a large outer lap E and distributes the steam While running.

a small outer lap e. Thissmall second slide valve .is hereinafterl desi na'tedv as the su plementary admission slide valve.` ordinary construction the admission ports d (Fig. 1) are in turn kept open up to about 0,8 of the stroke by the main valve S, whereas aceordingto my invention the supplementary slide valve s is provided for' the purpose ofobtaining a cut, off at about 0,8 ,of the stroke, and I connect it with the gearing,-

While the main valve cuts off theadmission' portsalways at about half stroke, so that a supplementary charge 'of steam is admitted into -the c linder from half stroke to almost the-end o the stroke 'by the supplementary slide valve. Compare thegslide'valve diaj yThis valve S is connected with a secv jond and smaller slide valve s (Fig. 2) having Inte'u gram 3 in which the circles 1 (S) and 11 y s) represent 'the paths of the slide valves S ands, which are adjusted both on the same line a Jorlead (that is to saythe admission port openings are equally opened); E and e are `the outer laps of 'the main and the small slide valve respectively. From this diagram it can be seen that the admission port is' cutoff by the main slide valve at the crank position F, whereas the admission port is cut off by the small supplementary slide valve at la later time, namely at Fv and also at that place the main slide valve' having a small inner lap begins to open the steam exit. Such a supplementary admission slide valve can IOO be employed with any valve gear or link motion.

In valve motions provided with ajsingle .l

eccentric such as' Heusingers linkI motion or in valve motions having no eccentric such as Joys link motion the lead angle, being indethe cordance with the outer lap of the slide pendent of the outer valve lap, is constantly equal to zero.' The lead of the slide valve is in this case produced by the lever U (Fig. 13) hereinafter called the lead lever, operated by guided crosshead of the piston rod in acvalve. For this purpose the supplementary vadmission slide valve having the small outer lap is connected vbypivotal points with the i 4 lead lever fu ofthe main valve having a large outer lap in such way that the'stroke of the supplementary admission slide valve g is smaller than the strokeof the main valve by the difference between the outer valve laps of both the valves. The` outer la of the supplementary admission valve is c osen so large, that it'only cuts loff at 0,8 of the piston stroke or evenlater, or preferably up to that piston position at which the main valve opens lower end of which lever as is the case with.

. moved by the dis mentary the cylinder Vto exhaust. In link motions having two eccentrics (Stephenson, Allan, Grooch) the eccentric angles must be enlarged for the purpose of obtaining earlier vl cut off in accordance with the .enlargement'of the outer valve lap for example from about 30 degrees to about 45 rees. In both cases the same eccentric may dmission slide valve having a small lapvneeds'the diminishing of the ead angle (usually amounting to 30 degrees) aspecial lead lever i," 'for the purpose of diminishin the lead of the supplementary admission s 'devalve (Fig. 14) is employed, the

the lead lever of the single eccentric motion for example .of Heusingers link motion is cross head and the upper end of which is moved by the joint of the valve connecting'rod directly jointed to thev 'main valve rod, or tol a point running parallel with this joint (Fig. 4). y

Constructional forms 4for the connection of the small supplementary admission slide valve s with the large main slide valve S are illustrated by Figs. 4 to 11. illustrate the Allan link motion being provided With a weigh shaft w for transmitting motion from the gear A (Fig. 4) to the main piston valve S.l Alongside the latter the supplementary pistonl slide valve s is arranged and is operated by a special lever h arallel to the vmain valve lever and -by a I ead lever vf suspended from said lever h and connected with the cross, head K. In Fig. 5

the crank is "onf its dead. center and, in the normal section Figfboth the slide valves having equallinear lead, have opened the f steam admission ports d and 'i for the beginl ning of the piston stroke,

the operating device, for instance the cross-.head being in its be used. As however the supple.

Figs. 4 to 8' end position, whereas in Fi g.A 7 (almost vertical'crank position) the main slide valve s cuts oil the steam port keeps open the admission port sary for starting the engine.

i', as is neces- This supplementary admission is vfinished in the position of the crank indicated by dotted line in Fig.

exhaust. e

Figs. -9 to 11 illustrate in a diagrammatical manner Heusingers link motion with a piston valve. The Supplementary admission valve s is arranged-within the main valve S and connected with the lead .lever 'v' of the latter valve. For enabling the steam to .pass to the piston ofthe engine after the closing cl and the valve s j V7, in which, as will be understood from Fig.8, i l* the main valve opensthe port d for the steam. I l

of the main valve, the main valve S is provided with passages 'i which are'covered and uncovered y the supplementary valve s.

Whenv the crank is on the deadcenter', as in Fig. 9, the main slide valvejflias moved from its middle position by anar-nennt represented by E -la and the supplementary valve by an amount e-l-al. Therefore the valves at the lefthand end are. in the same straight line. A

When the crank is rotated to-the vertical position just prior 'to the position seenninFig. 10 the supplementary valve is not opening the steam admission ports, however it will 9 openlthe latter near that crank position and before the main valve shuts od. ln Fig. 10v the cut off bythe main valve-S is illustrated.

'In the crank position as`illustrated by Fig. 1 1

that is to say at 0,8 to 0,9 of the piston stroke the supplementary valve cuts off the supplementary admission of steam and the main valve permits `-the steam to. exhaust. The crank of the other cylinder then continues the rotary motion at the corresponding crank position.

T05.v The lsupplementary slide valve needs no exhaust opening as the exhaust is Ieffected solely bythe main valve.

The steam distribution with the valve operatin device is in its en d osition, and the supp ementary admission s ide valve arranged in the main valve is illustrated by the diagram Fig. 12. I (S) designatesthe main slide valve circle, 11 (s) the supplementary admission slide valvecircle; E ande are the circles of the outer lap, and'. a, thelinear lead-.of both 'the valves.- Furthermore III IIO designates the circle vrepresenting the reout asupplementary slide valve and cutting off at 0.8' of the stroke the valve motion havling a suplementary slide valve is arranged to cut o at latest at about half stroke and ISO still earlier cut off than hitherto.

the diminishing of the charge of steam the steam cylinders are enlarged in a suitable manner in accordance with the diminishing of the largest charge of steam which is given by a cut o about 0,8 to about 0,5 of the stroke. Owing,to Vthe arrangement according to my invention the valve motion provided With a supplementary slide valve perp mits the employment of larger cylinders than hitherto used Jfor the purpose of diminishing the consumption of steam by employing` a higher degree of, expansion. The .supplementary side valve is arranged 4to uncover v the admission ort'only when the engine iS starting, and t at between a quarter t'o a ,half rotation of the y wheel or, ifa locomotive, oi" the driving wheel.' The supplementary charge of steam slowlylls the cylinders at a pressure the cylinders bein relatively large, compared with the size o the ports the steam'admitted being lsufficient, for the purpose of starting the engine or of driving the driving wheels. During the further ro'- tation of the wheels the steam admitted by the mainA slide valve is then acting and when the piston'speed increases, only a very small supplementary supply of steam is admitted to the cylinder owing to thesupplementary valve uncoveringonlysmall inlet4 ports and' owing tothe resistance of the. reacting eX- pandlng steam pessure.

Having thus lly described the nature of my invention, what I desire to secure by Letters Patent of the AUnited States is (S) has closedlthesteam admission ports (d) i' `for the purpose of giving a supplementary charge to cylinder when the engine is starting..

' 2; A valve-gear especially suited for twin" cylinder engines', comprising a main slide -valve (S), means for operating said-valve, a'y

supplementary slide-valver (s) provided -with ysmall port holes (i) in direct'connectlon to `cylinder, -means for operating the supplementary val-ve, a swiv 'nglever (12,) connected to bothslde va ves and -means for `operating same in order to permit anadditional steam-charge` to enter the cylinder through port-holes (i) after main slide valve (S) has .closed the steam admission ports (d) for the purpose of, giving a supplementary charge to cylinder when the engine is starting. 3. A valve-gear especially suited for twin lcylinder englnes, `comprising 4a main-slide- ,valve (S), means Orperating said valve, a supplementary slide-valve (s) provided with small port holes (i) in direct connection-to cylinder, means for operating the supplementary valve', a swinging lever (o) connect- 'ed to both slide-valves, means for operating same, a suspended connection between the other end of this swinging lever and the cross- `heard in yorderto permitan additional steamcharge to enter the cylinder through portholey (i) .after main-slide-valve (S) as has closed the steam admission ports (d) for the purpose of giving a supplementary charge to cylinder when the engine is starting.

4. A valve-gear especially suited for twincylinder engines, comprising a main-slidevalve (S)means for operating 'said valve, a supplementary slide-valve (s)l stationary arranged on a special facefin order to permit an additionalsteam charge to enter the. cylinder withinl the main slide-valve (S) forthe supplementary` slide-valve (s) to work in, means for operating the valves in order to permit anl IOO additional steam-,charge to enter the cylinder through port-hole (i.) after thel main slide valve (S) has closed itsv steam admission ports (d) 4for the purpose of giving a supple- IIO mentary charge to cylinder when the engine is starting.

In witness whereof I have hereunto set my l hand in the presence of two witnesses.

ROBERT LINDNER. Witnesses y CHEMNITZ H. SoHILLrNe, PAUL ARRAS. 

